I'm not entirely sure how likely it is that your local chain will have installed a 4K projector; I haven't been following the industry statistics at all. I would guess it depends on the population in your area and whether the chain owners feel that the specific venue draws (or will draw) enough audience to justify the expense.

On the whole, my best guess is that 2K are still far more common than 4K, but that it will be fast changing. Hopefully your theater will respond saying they've just installed a shiny new one. Man is but an ass if he go about to expound this dream.